Help please on all 1,2,3,4, and bounus

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?